function getScrollTop()
{
  var scrollTop=0;
  if(document.documentElement&&document.documentElement.scrollTop)
  {
  scrollTop=document.documentElement.scrollTop;
  }
  else if(document.body)
  {
  scrollTop=document.body.scrollTop;
  }
  return scrollTop;
}


function getScrollHeight()
{
  return Math.max(document.body.scrollHeight,document.documentElement.scrollHeight);
}


function getClientHeight()
{
  var clientHeight=0;
  if(document.body.clientHeight&&document.documentElement.clientHeight)
  {
  var clientHeight = (document.body.clientHeight<document.documentElement.clientHeight)?document.body.clientHeight:document.documentElement.clientHeight;
  }
  else
  {
  var clientHeight = (document.body.clientHeight>document.documentElement.clientHeight)?document.body.clientHeight:document.documentElement.clientHeight;
  }
  return clientHeight;
}
